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Pittsburg Plate & Glass (PPG)

 

Early PPG glass is coded with a 2-digit PPG plant code followed by a month/year 2- or 3-digit code while late codes are in Julian date format such as 2579 where 25 is the plant code, 7 is the month (July), and 9 is 1969.

 

Libby-Owens-Ford (LOF)

 

Libby-Owens-Ford uses a two-letter dating system. The first letter is the month code, the second letter is a year code.

 

Month Code Year Code
N - Jan G - 1964/1977
X - Feb J - 1965/1978
L - Ma A - 1966/1979
G - Apr Z - 1967/1980
J - May X - 1968/1981
I - Jun V - 1969/1982
U - July T - 1970/1983
T - Aug N - 1971/1984
A - Sep Y - 1959/1972
Y - Oct U - 1960/1973
C - Nov L - 196/1974
V - Dec I - 1962/1975
  C - 1963/1976

Other information found on glass include
* Shaded Soft-Ray - if the glass is tinted
* AS - American Standard Association
* AS-1 - The -1 indicates windshield glass (Laminated)
* AS-2 - The -2 indicates body glass (Tempered)
* M3 - LOF manufacturing code for non-tinted windshield
* M4 - LOF manufacturing code for tinted windshield
* M51 - LOF manufacturing code for body glass

 

Windshield - GM Group 1.027
Ventilator Glass - GM Group 10.658
Front Side Glass - GM Group 10.681
Rear Quarter Glass (4-door) - GM Group 10.741
Rear Quarter Glass (2-door) - GM Group 11.011
Rear Window Glass - GM Group 11.204
Station Wagon Rear Window Glass - GM Group 12.180